diff --git a/.github/workflows/GnuComment.yml b/.github/workflows/GnuComment.yml
index f74c022ed..f22abdf42 100644
--- a/.github/workflows/GnuComment.yml
+++ b/.github/workflows/GnuComment.yml
@@ -48,5 +48,5 @@ jobs:
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: issue_number,
-              body: fs.readFileSync('./result.txt')
+              body: String(fs.readFileSync('./result.txt')),
             });